Electric-arc lamp.



un. 669,0l5. 'Patented Feb. 26, |9ol.

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ELECTRIC ARC LAMP.

(Applicntion led Nov. 30, 1900.) (No nodal.)

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UNITED STATES PATENT OEEIcE.

GUSTAV RASMUS, OF NEW YORK, N. Y.

ELECTRIC-ARC LAM P.

SIECIFICATION formingpart of Letters Patent No. 669,015, dated February 26, 1901.

Application filed November 30, 1900. Serial No. 38,179. (No modeL vide an arc-lamp of very simple and com paratively inexpensive construction and of high eiliciency with a less current than ordinarily required for arc-lamps.

I will describe an arc-lamp embodying my invention and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional elevation of a lamp embodying myinvention. Fig. 2 isa section on the line 2 2 of Fig. 1, and Fig. 3 is a section on the line 3 3 of Fig. 1.

The lamp comprises a frame 10, on which is supported a resistance-coil 11, connecting at one end with the leadingin wire 12 and connecting at the other end with a metal tube 13, which is closed at its upper end bya hood or cap 14. Arranged within the frame 10 is a solenoid 15, which is also comprised in the electric circuit, Extended through the solenoid and for a distance below the same is a brass tube 16, in which the tubular core 17 operates. This core 17 is rigidly connected to an inner tube 18, within which the upper carbon 19 is located. Attached to the upper end ofthe solenoid-spool is a collar 20,through which the tube 18 is free to move. The upper end of the carbon y19 is engaged in a socket piece 21, movable vertically in the tube 18, and to insure an electrical contact between the socketpiece and the tube 18 I provide said socketpiece with downwardly and outwardly inclined openings 22, in which metal balls 23 are arranged. These metal balls 23 are pressed outward by a larger or heavier ball engaging with the upper balls 23.

Attached to the lower end of the tube 16 is a plate 24, and attached to this plate 24, but

insulated therefrom, is a plate 25, having an opening at its center, which surrounds a hub extended downward from the plate 24. This plate 25 has a downwardly-extended externally-threaded hub portion, with which an interiorly-threaded globe-supporting ring 26 engages. The globe 27 is removably connected to the ring 26 and kat its lower end is attached a metal collar 28, through which the socketpiece 29 for 'the lower carbon 30 engages. The lower carbon is electrically connected to the collar 26 and to the plate 25 by means of a wire 31, which is preferably arranged within the globe 27. While I have shown but one wire 3l, there may be two or more. A leading-out wire 32 connects with the plate 25 through the binding-post 33.

Carried by the lower end of the tube 18 are carbon-clam ping blocks 34. These clampingblocks 34 have link connections 35 with a ring 36, having screwthread engagement with the lower end-of said tube 18. A yielding electrical connection is provided between the tubes 16 and 18 bymeans of a coiled spring 37, which is connected at one end to said tube 16 and and at the other end to the tube 18. This form of spring allows a vertical movement of the tube 18 relatively to the tube 16.

In operation when the current is out out momentarily the tube carrying the upper carbon will move downward, so that the end of said carbon engages with the lower carbon. Upon its downward movement the ends of the clamping-blocks will engage against the upper side of the plate 24, moving them slightly outward to release the carbon. As the current is closed, however, by the carbons coming in contact the solenoid 15 will be energized, drawing the core upward, causing the clam pin g-blocks to engage with the upper carbon, raising it out of engagement with the lower carbon, and thus forming the arc. The current of course passes through the wire 12, the resistance-coil, and through the carbons, and thence out through the wires 31 and 32. As the carbone wear away the upper carbon will move downward relatively to the tube 18.

It will be seen thata lamp embodying my invention may be very cheaply made because only one resistance-coil and one solenoid are required, and as the parte are arranged one upon another the lainp will take up but very little space.

Having` thus described my invention, I claim as new and desire to secure by Letters Patentl. In an arc-lamp, a solenoid, a tube extended through the solenoid and projected below the same to a considerable distance, a eollar attached to the upper end of the solenoid, an inner lube movable through said collar and through the Firstnamed tube, a solenoid-core attached to said inner tube, a oarboirholder movable in the inner tube, a plate attached to the lower end of the lirst-nauied tube and having au opening` for the passage of a earbou, and carbon-clamping devices carried by the inner tube and adapted to be moved to open position by Contact with said plate,- sub stantially as specified.

2. In an are-lainp, a solenoid, a tube extended downward froin said solenoid, an inner tube for carrying the carbon, a core for the solenoid connected to said inner tube, a plate attached to the lower end of the firstnained tube, a lower plate having an opening through which the tubular hub of the firstnanied plate extends, the said plates being insulated one from the other, a downwardly-extended hub on the lower plate having an exterior screw-thread, and a `globe-supporting ringa engaging with said scre\v-i'.l1rcad, substantially as specified.

3. In an arc-lamp, a solenoid, a tube eX- tended downward from the solenoid, a plate on the lower end of said tube and having an opening` through which a carbon may move, a core, an inner tube attached to the eore, opposite carbon-clamping blocks, and link connec-tions between said blocks and a part on thelowerend of the innertube, thesaid blocks being extended to engage with said plate to inove the blocks to open position, substantially as specified.

4. In an arc-lamp, a ctirbon-carrying tube, a socketpiece movable in said tube and havingoppositely-extended downwardly-inclined openings, rolling eontaot devices in said openings, and a rolling` device of greater weight than the contacts and engaging therewith to press them outward, substantially as speci fied.

In testimony whereoic I have signed my name to this specification in the presence ot' two subscribing witnesses.

GUSTAV 3tASMUS.

Witnesses:

LOUIS BAER, B. MoEsEu. 

